From 53440c621bb242478cf5a72703b64b68e253c504 Mon Sep 17 00:00:00 2001 From: Bartlomiej Wolowiec Date: Fri, 29 Aug 2008 21:35:57 +0000 Subject: Okayed parts of nellymoserenc.c Originally committed as revision 15039 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/nellymoserenc.c | 144 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100644 libavcodec/nellymoserenc.c diff --git a/libavcodec/nellymoserenc.c b/libavcodec/nellymoserenc.c new file mode 100644 index 0000000000..bc01a50e73 --- /dev/null +++ b/libavcodec/nellymoserenc.c @@ -0,0 +1,144 @@ +/* + * Nellymoser encoder + * This code is developed as part of Google Summer of Code 2008 Program. + * + * Copyright (c) 2008 Bartlomiej Wolowiec + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file nellymoserenc.c + * Nellymoser encoder + * by Bartlomiej Wolowiec + * + * Generic codec information: libavcodec/nellymoserdec.c + * + * Some information also from: http://www1.mplayerhq.hu/ASAO/ASAO.zip + * (Copyright Joseph Artsimovich and UAB "DKD") + * + * for more information about nellymoser format, visit: + * http://wiki.multimedia.cx/index.php?title=Nellymoser + */ + +#include "nellymoser.h" +#include "avcodec.h" +#include "dsputil.h" + +#define BITSTREAM_WRITER_LE +#include "bitstream.h" + +#define POW_TABLE_SIZE (1<<11) +#define POW_TABLE_OFFSET 3 + +typedef struct NellyMoserEncodeContext { + AVCodecContext *avctx; + int last_frame; +} NellyMoserEncodeContext; + +static float pow_table[POW_TABLE_SIZE]; ///< -pow(2, -i / 2048.0 - 3.0); + +static const uint8_t sf_lut[96] = { + 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, + 5, 5, 5, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 13, 13, 14, + 15, 15, 16, 17, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 26, + 27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, + 41, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 52, 52, 53, + 54, 55, 55, 56, 57, 57, 58, 59, 59, 60, 60, 60, 61, 61, 61, 62, +}; + +static const uint8_t sf_delta_lut[78] = { + 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, + 4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 9, 10, 10, 11, 11, 12, + 13, 13, 14, 15, 16, 17, 17, 18, 19, 19, 20, 21, 21, 22, 22, 23, + 23, 24, 24, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 27, 28, + 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 30, +}; + +static const uint8_t quant_lut[230] = { + 0, + + 0, 1, 2, + + 0, 1, 2, 3, 4, 5, 6, + + 0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11, + 12, 13, 13, 13, 14, + + 0, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8, + 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, + 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 29, + 30, + + 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, + 4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8, 9, 9, 9, + 10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15, + 15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 20, 20, 20, + 21, 21, 22, 22, 23, 23, 24, 25, 26, 26, 27, 28, 29, 30, 31, 32, + 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 44, 44, 45, 45, + 46, 47, 47, 48, 48, 49, 49, 50, 50, 50, 51, 51, 51, 52, 52, 52, + 53, 53, 53, 54, 54, 54, 55, 55, 55, 56, 56, 56, 57, 57, 57, 57, + 58, 58, 58, 58, 59, 59, 59, 59, 60, 60, 60, 60, 60, 61, 61, 61, + 61, 61, 61, 61, 62, +}; + +static const float quant_lut_mul[7] = { 0.0, 0.0, 2.0, 2.0, 5.0, 12.0, 36.6 }; +static const float quant_lut_add[7] = { 0.0, 0.0, 2.0, 7.0, 21.0, 56.0, 157.0 }; +static const uint8_t quant_lut_offset[8] = { 0, 0, 1, 4, 11, 32, 81, 230 }; + +static av_cold int encode_init(AVCodecContext *avctx) +{ + NellyMoserEncodeContext *s = avctx->priv_data; + int i; + + if (avctx->channels != 1) { + av_log(avctx, AV_LOG_ERROR, "Nellymoser supports only 1 channel\n"); + return -1; + } + + avctx->frame_size = NELLY_SAMPLES; + s->avctx = avctx; + ff_mdct_init(&s->mdct_ctx, 8, 0); + dsputil_init(&s->dsp, avctx); + + /* Generate overlap window */ + ff_sine_window_init(ff_sine_128, 128); + for (i = 0; i < POW_TABLE_SIZE; i++) + pow_table[i] = -pow(2, -i / 2048.0 - 3.0 + POW_TABLE_OFFSET); + + return 0; +} + +static av_cold int encode_end(AVCodecContext *avctx) +{ + NellyMoserEncodeContext *s = avctx->priv_data; + + ff_mdct_end(&s->mdct_ctx); + return 0; +} + +AVCodec nellymoser_encoder = { + .name = "nellymoser", + .type = CODEC_TYPE_AUDIO, + .id = CODEC_ID_NELLYMOSER, + .priv_data_size = sizeof(NellyMoserEncodeContext), + .init = encode_init, + .encode = encode_frame, + .close = encode_end, + .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY, + .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao Codec"), +}; -- cgit v1.2.3